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Load whatever is well-formed and means one thing: ignore a part with no effect, print a constant sample, render any JSON value, draw no weight-0 item, and let a name, a rows file, a struct or a CLI flag go unused

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This commit is contained in:
Lilleman auf Larv
2026-10-07 23:39:59 +02:00
committed by Lillem4n
parent 052a52fc7a
commit ee236d7955
14 changed files with 165 additions and 213 deletions
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cmd/fejkdata/main.go
+24 -37
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@@ -45,8 +45,8 @@ path into one ({/sv_SE.person.last}), a table's row by key or name
Under --format text, the default, what you send is what renders, and fejkdata adds
nothing: a format string keeps every byte, so echo's newline ends each render, and
printf '%s' sends none. -n joins renders with --separator, empty by default. A JSON
template is an object, array or string, and the whitespace around it is dropped; null,
42 or true alone is refused. A quoted heredoc, <<'EOF',
template is any JSON value, and the whitespace around it is dropped; 42 or true alone
renders its text, and null nothing. A quoted heredoc, <<'EOF',
passes $, a backslash or a quote as written.
With --format json, ndjson, csv or sql the template must be a record — a JSON
@@ -58,12 +58,14 @@ one INSERT.
-d, --data-path D a data directory to layer over the shipped data (repeatable; last wins on a clash)
--format F output form: text (default), json, ndjson, csv or sql
-h, --help print this help, then exit
--list list the paths the data offers, each written after {/ in a template, then exit
--list list the paths the data offers, each written after {/ in a template, then exit;
--repeat, --separator, --format and --table do nothing here
--no-shipped-data load only the --data-path directories
-n, --repeat N render the template N times, 1..1048576 (default 1)
-s, --seed N same seed, version and data: identical output
--separator S string between repeated renders (default empty)
--table T the INSERT target for --format sql (default: a lone reference's last segment, else records)
--separator S string between repeated renders (default empty); a record --format ignores it
--table T the INSERT target for --format sql, ignored under any other
(default: a lone reference's last segment, else records)
--version print the version, then exit
A short flag's value attaches or follows (-n3, -n 3); short flags bundle (-hn 3);
@@ -71,22 +73,19 @@ A short flag's value attaches or follows (-n3, -n 3); short flags bundle (-hn 3)
`
type invocation struct {
args []string
dirs []string
format string
formatSet bool
help bool
list bool
noShipped bool
repeat int
repeatSet bool
seed uint64
seeded bool
separator string
separatorSet bool
table string
tableSet bool
version bool
args []string
dirs []string
format string
help bool
list bool
noShipped bool
repeat int
seed uint64
seeded bool
separator string
table string
tableSet bool
version bool
}
type flagDef struct {
@@ -98,7 +97,7 @@ type flagDef struct {
var flagDefs = []flagDef{
{"data-path", "d", true, func(in *invocation, v string) error { in.dirs = append(in.dirs, v); return nil }},
{"format", "", true, func(in *invocation, v string) error { in.format, in.formatSet = v, true; return nil }},
{"format", "", true, func(in *invocation, v string) error { in.format = v; return nil }},
{"help", "h", false, func(in *invocation, _ string) error { in.help = true; return nil }},
{"list", "", false, func(in *invocation, _ string) error { in.list = true; return nil }},
{"no-shipped-data", "", false, func(in *invocation, _ string) error { in.noShipped = true; return nil }},
@@ -107,7 +106,7 @@ var flagDefs = []flagDef{
if err != nil || n < 1 || n > fejkdata.MaxRepeat {
return fmt.Errorf("--repeat needs an integer in 1..%d, got %q", fejkdata.MaxRepeat, v)
}
in.repeat, in.repeatSet = n, true
in.repeat = n
return nil
}},
{"seed", "s", true, func(in *invocation, v string) error {
@@ -118,7 +117,7 @@ var flagDefs = []flagDef{
in.seed, in.seeded = n, true
return nil
}},
{"separator", "", true, func(in *invocation, v string) error { in.separator, in.separatorSet = v, true; return nil }},
{"separator", "", true, func(in *invocation, v string) error { in.separator = v; return nil }},
{"table", "", true, func(in *invocation, v string) error { in.table, in.tableSet = v, true; return nil }},
{"version", "", false, func(in *invocation, _ string) error { in.version = true; return nil }},
}
@@ -266,15 +265,9 @@ func (in invocation) checkFlags() error {
if _, ok := recordFormats[in.format]; !ok && in.format != "text" {
return fmt.Errorf("--format takes %s, got %q", formatNames(), in.format)
}
if in.tableSet && in.table == "" {
if in.tableSet && in.table == "" && in.format == "sql" {
return errors.New("--table names the INSERT target, so it cannot be empty")
}
if in.tableSet && in.format != "sql" {
return errors.New("--table names the INSERT target, so it needs --format sql")
}
if in.writesRecords() && in.separatorSet {
return errors.New("--separator joins text values, so it has no effect with --format " + in.format)
}
return nil
}
@@ -314,9 +307,6 @@ func (in invocation) check() error {
if len(in.args) > 0 {
return operandError(in.args[0])
}
if in.list && (in.repeatSet || in.separatorSet || in.formatSet || in.tableSet) {
return errors.New("--list takes no --repeat, --separator, --format or --table")
}
return nil
}
@@ -459,9 +449,6 @@ func parseInput(raw string) (input, error) {
if trimmed == "" {
return input{}, fmt.Errorf("stdin holds no template: %s", pipeHint)
}
if trimmed == "null" {
return input{}, fmt.Errorf("stdin holds only null, as jq prints for a missing key: %s", pipeHint)
}
text := raw
if json.Valid([]byte(trimmed)) {
text = trimmed